Justine Jean-Lou, Briand Marine J
Equipe Biogéographie Marine Tropicale, Unité Systématique, Adaptation, Evolution (CNRS, UPMC, MNHN, IRD), Institut de Recherche pour le Développement, BP A5, 98848, Nouméa Cedex, New Caledonia.
Syst Parasitol. 2010 Mar;75(3):159-79. doi: 10.1007/s11230-009-9224-4. Epub 2010 Feb 16.
Three new species of Lamellodiscus are described from four (including two undescribed) species of Gymnocranius off New Caledonia, South Pacific. All three species have a similar body anatomy and morphology of the haptoral hard parts and are distinguished on the basis of the male copulatory organ (MCO). Lamellodiscus tubulicornis n. sp. (type-host: G. grandoculis; other host: Gymnocranius sp. B) has an MCO with a tube and horn; L. magnicornis n. sp. (type-host: G. grandoculis; other hosts: G. euanus, Gymnocranius sp. A and Gymnocranius sp. B) has an MCO with a long horn and a membrane; L. parvicornis n. sp. (type-host: G. euanus; other hosts: G. grandoculis and Gymnocranius sp. B) has an MCO with a small horn and a membrane. Lamellodiscus epsilon Yamaguti, 1968 is redescribed based on the type-specimens (from Monotaxis grandoculis off Hawaii). Lamellodiscus sp. is recorded from Gnathodentex aureolineatus off New Caledonia. All these five species have lamellodiscs that exhibit a unique characteristic: the second lamella forms an almost closed circle, in contrast to all other described species of Lamellodiscus in which the second lamella has the form of one or two crescents. Lamellodiscus spp. are usually classified in two groups, the 'ignoratus' and 'elegans' groups, according to the structure of the lamellodisc; we propose a new 'tubulicornis' group for these five species. In addition to their lamellodisc structure, species of the tubulicornis group are also characterised by their egg (elongate in contrast to tetrahedral in the two other groups) and their hosts (monotaxine lethrinids as opposed to mainly sparids). The generic diagnosis of Lamellodiscus given by Amine & Euzet (2005) is amended to include species with elongate eggs.
从南太平洋新喀里多尼亚附近的四种裸头鲷（包括两种未描述的物种）中描述了三种新的片盘虫属物种。这三种物种的身体解剖结构和吸器硬体部分的形态相似，根据雄性交配器官（MCO）进行区分。管角片盘虫新种（模式宿主：大眼裸头鲷；其他宿主：裸头鲷属物种B）的雄性交配器官有一根管子和一个角；大角片盘虫新种（模式宿主：大眼裸头鲷；其他宿主：欧氏裸头鲷、裸头鲷属物种A和裸头鲷属物种B）的雄性交配器官有一个长角和一层膜；小角片盘虫新种（模式宿主：欧氏裸头鲷；其他宿主：大眼裸头鲷和裸头鲷属物种B）的雄性交配器官有一个小角和一层膜。基于模式标本（来自夏威夷附近的大眼单指鲷）对1968年的雅氏片盘虫进行了重新描述。记录了新喀里多尼亚附近金线裸颊鲷身上的片盘虫属未定种。这五个物种的片盘都呈现出一个独特的特征：第二片形成一个几乎封闭的圆圈，这与所有其他已描述的片盘虫属物种不同，在其他物种中第二片呈一或两个新月形。根据片盘的结构，片盘虫属物种通常分为两组，即“ignoratus”组和“elegans”组；我们为这五个物种提出一个新的“tubulicornis”组。除了它们的片盘结构外，tubulicornis组的物种还具有卵（与其他两组的四面体形状不同，呈细长形）和宿主（单指鲷科丽鲷，而不是主要为鲷科）的特征。对阿明和于泽（2005年）给出的片盘虫属的属诊断进行了修订，以纳入具有细长卵的物种。
